Lesson 14 Climate Change

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Geog 120 climate change lecture

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Lesson 14 Climate Change

  1. 1. “ Climate is what we expect, weather is what we get.” --Mark Twain
  2. 2. Climate Change
  3. 3. Morteratsch Glacier and Piz Bernina, Canton Graubünden, 1911 and 2005
  4. 4. From National Geographic magazine April 2009, page 24.
  5. 5. CO 2 levels
  6. 6. Ice core data
  7. 7.                                                                              Analysis of ice core data from Antarctica by Indermühle et al. (GRL, vol. 27, p. 735, 2000), who find that CO 2 lags behind the temperature by 1200±700 years.
  8. 8. Green House Gasses <ul><li>Gas Lifetime Conc. Forcing </li></ul><ul><li>Carbon Dioxide (CO 2 ) 50-200 382ppm 1 </li></ul><ul><li>Methane (CH 4 ) 10 1.7ppm 27 </li></ul><ul><li>CFC’s 65-130 ~300ppt 135000 </li></ul><ul><li>Nitrous Oxide (N 2 O) 150 310ppb 210 </li></ul><ul><li>Water Vapor short variable ?? </li></ul>
  9. 9. Oceans absorption of CO 2 changes with temperature, salinity, organic matter…
  10. 10. Milankovitch cycles
  11. 11. General Circulation Model Figure 7.28
  12. 12. Annual Mean Surface Air Temperature Change, 1971–1990 to 2041–2060 Figure 7.29
  13. 13. An interesting experiment is going on in Nevada to test what might happen with plant growth under increased CO 2 FACE – Free Air CO 2 Enrichment experiment on the Nevada Test Site.

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